Web Goblin cnc has begun

[Web Goblin]

Right then I have managed to get some more time on my build so here is an update.
Timing belt fitted for my Y axis drive and motor mount set up and tensioned.


I will eventually make a guard for it. I was thinking about clear perspex so that I can see any problems with the belt if they appear.

I have assembled the X axis ballscrews, nuts and mounts. Made up the spacer blocks and got them all fitted and set up.


Also got the couplings bored out and fitted and the motors mounted.



I managed to get a start on the control panel as well. Job for tomorrow is to remember where I stashed a short length of 75mm x 75mm alu angle to make the mounts for the limit switches and get them done. The limit switch brackets will be fitted with tee nuts in the extrusion slots so that I can adjust then to get the best working area from the machine.
Hopefully the next update will be a bit sooner than the last ones have been.

Ian

[Jonathan]

No flanges on the Y-axis pulley could cause problems, but I guess if the belt doesn't fall of then nothing to worry about. Why have you extended the motor shaft then put a pulley on the end? It seems an expensive way to do it. Surely the motor bearings are sufficient to take the belt tension, or was there another reason? The reason I mention it is you've now added the moment of inertia of that shaft to the system which will affect your acceleration a little.

Which motors are those? I'll be interested to see what feedrate you can get on the X-axis, and whether it's limited by screw whip or motor torque. I'd have been inclined to get 10mm pitch screws. With 20x5mm over that length you're limited to roughly 5000mm/min in theory. Twice that feedrate but less resolution (depending on pulleys) with 10mm pitch screws. Bit late now I guess.

What size is the box section you've used for the frame?

Looks like you're not far off running it now